Telegraphic transmitter.



I. E. DELANY. TELEGBAPHIG TRANSMITTER.. AMMUATION YILED A191126, 1906. RBNBWBD Nov. 5, was.

Pawnted June 16, 1914.

Arm/mfr lll l mal position, `with the .blade or some part beyondthepoint ofcou- UNITED STATES PATENT OFFICE.

PATRICK' n. nnILANY, or SOUTH ORANGE, NEW JERSEY.

TELEGRAPHIC TRANSMITTL Specification o f'Letters Patent. Patented J 11119 16, 1914.

.'ipplication filed April 26, 1906, Serial No. 313,753.8. Renewed November 5, 1913. Serial No. 799,375.

To all whom t muy concer/1;.' Be it known that l, Pimmel; B. DnmNr, a citizen of the United States, residing in South Orange, county of Essex, State of New Jersey, have invented :certain new and useful limi rovements in Telegraphic Transmitters, oi which the following is a specification.

`'lilhis invention relates primarily to that class of transmitters in which a series of dots representin0 a signal. character or letter is .automatically formed by one movement of a hey lever, the number of -dots depending upon the period of time during which the le ver, .is held in dot position. Dashes are' iormedkin such instruments by a movement ofthe, 'ey lever in opposite dlrection, or by actuation. of some supplementary dash contact device. The utility and general purposeof instruments of this character are well understood The particular class of such instruments to which this inyention relates is that in.A which the dot forming member is a vibrator resembling a reed;l but capable of vi rations ofsuch period and amplitude as to satisfactorily', transmit successions of dot signals; or impulses. Such a vibrator When intoivibration bymoveinent of the transmitting key will, by its substantially uniform continued aetiomelect transmission of dots m regular succession..

.,. gli, primary object of. this invention is to make the loa-dupon the key as light as possible; ,toeliminate fro; the key the jars or vibrator eiiectsof theibrator and to impart to the vibrator abrupt, quicky impacts that set it into vibration an the force of which is ,determined by the operator.

A further object is tox reduce to a minimum liability/ of splitting`-the dot impplses, and thisfeature ofthe invention is applicable to auto-dot key transmitters ,of various kinds or type, manyof v vliitli arenow known and vsome ofwhich are now in, practical use.

, The inyention comprises the employment 'of avibratory member consisting of a rigid,

or relativelyrigid, ,leverroclmg about an axis and carrying at one'end e resilient vibratinv blade to .which a weight, preferabl movable for adjustment, 1s, applied. l il springholds this vibratory member in norresilient vibrating neotion vviththe, rigid lever against a stop. Fihen acted upon'liy theeylever the rela sven sgae pas sf es e raar-y# mertr s l yielding contact, to

thrown against a rigid limiting stop, impact upon which, together with the co-incident momentum of the Weighted blade, sets the latter into vibration and causes it to make and break the circuit at a suitable so form or transmit a succession of dot signals, that continues during the time that the parts remain in dot forming position. To prevent splitting of the dot impulses, there are included in the circuit a pair of unyielding contacts that are positively separated at the initial movement of the key toward normal position.

. In the accompanying drawings: Figure l is a diagrammatic plan View showing an arrangement for dot and dash transmission according to the Morse or other-codes: and

Fig. 2, is a similar view showin an arrangement for cable transmission 1n which dot impulses only are sent into the line..

eferring to Eig. 1, a is a key lever rocking about a vertical axis b. It isprovided at one end with a thumb plate c and finger head d by which it may be moved either to the lett or right ofA normal central position in which it is maintained by oppositely act ing springs e. Mounted parallel with the rear portion of the key lever is a lever arm f rocking about a vertical axis g, and to one end of which there is rigidly secured a flat spring vibrating blade h enlarged at its outer end and having there appliedan adj ustable Weight or bob j. A spring 7u applied to the lever arm j normally .draws they resilient vibratory part agains alimiting stop' m which also serves to deaden or suppress vibration when the parts return tonormal position. On the other side of the vibratory member is a rigid limiting stop 'nj against which the rigid lever arm f abuts, fand also a yielding electrical contact o with which the resilient vibratory part is adapted to make and break contact.l On the rear end of the key lever is a lateral projection which when the partsare all in normal position as shown-in the drawings, is in Contact with the end of the lever f that extends in rear of its axisg.

The lcircuit connections are as follows: fa source of energy or main battery M B has one pole rounded, and its other pole c onnected to t e yieldin contact 0, stop n being connected to line. y lVhen the front end of the key lever is `thrown to the right, projection p acts upon levier arm'f and throwsyit abruptly against stop The vibratory vibrator carried by tbe leverA and set intoy vibration when saidaim is`alrested by its stop, a contactthrough which the lvibrator automatically transmits dots gn" cuit contacts closed by the key when 'moved-1 to actuate the lever arm and opened on 1|e-` verse movement of thekey.

9.A telegraphic transmitter comprising a key' lever, a separately mounted lever-havingv a yibratile art, and means whereb the said separate y mounted lever is letvlbrating to transmit dots automatically by being pushed by the key lever.

'rigid 'part is.

E. F. Blom'tuw, E. F. Wma.

leva? 1s. 

